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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '678ebe5620d8750997f8887ad53eef390e0b2d7ac9bf3366623de8f83f640d6e' 
  AND token = 'sjhnFe2tlOQMgJx8RsBRi3Ikmijn9D/5S/5zrLVvm0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}